CVE-2023-0091Network attack vector

Unauthorized client creation via unchecked token revocation

Published Jan 11, 2023 · Updated Apr 9, 2025

Incorrect authorization in Keycloak 20.0.2 and earlier allows remote authenticated users to create clients with a revoked token. The /clients-registrations/openid-connect endpoint accepts a revoked service-account access token without checking revocation before registering a client. Exploitation requires a token issued to a service account with create-client or manage-clients rights, permitting unauthorized client creation and resulting access or data modification.

CVSS severity3.8
Low
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Keycloak 20.0.2 and earlier allows remote authenticated users to create clients with a revoked token. The /clients-registrations/openid-connect endpoint accepts a revoked service-account access token without checking revocation before registering a client. Exploitation requires a token issued to a service account with create-client or manage-clients rights, permitting unauthorized client creation and resulting access or data modification.

The record

CVE
CVE-2023-0091
Published
Jan 11, 2023
Updated
Apr 9, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-284, CWE-863, CWE-20, T1136
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.8Red HatCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
6.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-863Incorrect Authorization
CWE-20Improper Input Validation
T1136Create Account

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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